Need opinion: shorted motherboard or CPU?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • rman3
    New Member
    • Jul 2014
    • 7
    • USA
    #1

    Need opinion: shorted motherboard or CPU?

    I built my latest computer with a Gigabyte B85-D3V motherboard and an Intel i3 G3220 CPU.
    It worked long enough for me to install windows 8.1 to my SSD
    but now when power button is pressed the PSU and CPU fans both run
    for about 2 seconds and then stop and then will then cycle again for 2 seconds.
    I am using this outside the case now with only CPU, memory and power supply connected. I have tried a different power supply and tried using only one memory chip so I am fairly certain it has to be either a bad motherboard or CPU.
    I removed the CPU and applied power and the PSU fan would cycle for 2 seconds. Does this indicate the motherbad is bad?
    I could return the CPU for factory warranty if I knew for sure it was bad.
    Is there any way to tell for certain which is defective? Also I am wondering
    if installing a good CPU in a shorted motherboard could ruin the CPU?
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30928
      • Albion
      #2
      Re: Need opinion: shorted motherboard or CPU?

      was the contact area on the cpu clean?
      are the socket contacts o.k.?
      can you try a different cpu-fan?
      if the fan tacho signal is bad the mobo may think it's not running and shutdown.

        Comment

        • Th3_uN1Qu3
          Believe in
          • Jul 2010
          • 6031
          • Romania
          #3
          Re: Need opinion: shorted motherboard or CPU?

          CPUs die very very rarely. If something's died, that must be the board. Power the board up with CPU but without the ATX12v connector plugged. If it turns on and stays on, you have a shorted VRM on the motherboard.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

            Comment

            • rman3
              New Member
              • Jul 2014
              • 7
              • USA
              #4
              Re: Need opinion: shorted motherboard or CPU?

              Thanks for replies. Here's an update:
              Now when I push the power button neither the CPU fan or PSU fan moves UNLESS I remove the ATX 12v 8pin connector. Then the CPU and PSU have the 2 second cycle as before.
              The CPU socket is clean and contacts are good. I have tried a different CPU fan with same result.

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30928
                  • Albion
                  #5
                  Re: Need opinion: shorted motherboard or CPU?

                  see if the pins are shorted together on the mobo 12v connector with a meter.

                    Comment

                    • rman3
                      New Member
                      • Jul 2014
                      • 7
                      • USA
                      #6
                      Re: Need opinion: shorted motherboard or CPU?

                      Measured between the pins on the 12v connector I get very low ohm readings (from about 1 to 7 ohms) but not a complete short. Is this normal?

                        Comment

                        • Th3_uN1Qu3
                          Believe in
                          • Jul 2010
                          • 6031
                          • Romania
                          #7
                          Re: Need opinion: shorted motherboard or CPU?

                          No. You have a shorted mosfet in the VRM.
                          Originally posted by PeteS in CA
                          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                          A working TV? How boring!

                            Comment

                            • rman3
                              New Member
                              • Jul 2014
                              • 7
                              • USA
                              #8
                              Re: Need opinion: shorted motherboard or CPU?

                              I suspected the MB was bad, glad you could confirm it for me.
                              So I plan on ordering a new MB (maybe not a gigabyte this time) but I am
                              wondering in case the CPU is shorted too, could this ruin the new motherboard?

                                Comment

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 30928
                                  • Albion
                                  #9
                                  Re: Need opinion: shorted motherboard or CPU?

                                  cpu is probably fine.

                                  someone with hot air should be able to replace the shorted fet(s) on the dead board.

                                    Comment

                                    Previous template Next

                                    Related Topics

                                    Collapse
                                    • samaelvonhell
                                      Acer Nitro 16 AN16-41 motherboard: DAZGUMB1AD0 turns off after 60 seconds
                                      by samaelvonhell
                                      Hello. Could anyone help me with that problem.
                                      Laptop model: Acer Nitro 16 AN16-41
                                      motherboard: DAZGUMB1AD0
                                      It had liquid contact and owner dried it up. Dried it so hard that keyboard is all wavy...
                                      I've found one drop on motherboard near B+ capacitor, it wasn't short.
                                      But motherboard works exactly 60 seconds and turns it self off. Not overheating just exactly 60 seconds. Normally I would say its ME Region problem, but CPU is AMD...
                                      In case im attaching BIOS backup
                                      08-01-2024, 08:11 AM
                                    • angeloavv
                                      ASRock H81M-DG4 power cycles and glitches - sometimes POSTs sometimes not
                                      by angeloavv
                                      Hello everyone! This is my first post and this motherboard is driving me crazy because everything looks so non-trivial that I don't know where to start investigating. During these days I believe I watched half of the YouTube videos trying to understand how to troubleshoot power cycles but at the same time, I'm confused because my motherboard doesn't always do that and sometimes completes the POST for a few seconds: the right amount of time to freeze, show glitches on the screen, and then reset itself.

                                      Let me give you a bit more context to understand why and how we got here.
                                      ...
                                      12-26-2023, 03:32 PM
                                    • glovecaps
                                      Asus ROG Strix Scar G533qm with a G733qm Motherboard, can I modify the Bios to accept G533 Bios
                                      by glovecaps
                                      Hello,

                                      I have a Asus ROG Strix Scar 15 (G533QM) that had a dead motherboard (Graphics card dead) and after trying to fix the motherboard with no success, I bit the bullet on a sale for a new motherboard. I ordered a motherboard for the 15 inch model which is the one that I have, and when the motherboard arrived it wasn't for a little while that I saw it was from the 17 inch model.

                                      My question is, can I update the Bios on this G733 motherboard to a G533 Bios.

                                      The reason for wanting to do this is that the keyboard isn't working as it should, and I think this...
                                      11-25-2024, 04:23 PM
                                    • Docus
                                      Legion Y540 17irh motherboard issue ( need help to know how to diagnose my motherboard)
                                      by Docus
                                      Hi everyone 😀,

                                      I'm here today to ask for help with repairing the motherboard of a Lenovo Legion Y540 17IRH.

                                      To give you some context, I'm passionate about computer repair so much so that I've invested in a lot of tools and started practicing on dead and old hardware. I've been learning how to solder and desolder components, mostly focusing on phone repairs.

                                      Recently, I bought a broken Lenovo Legion Y540 17IRH for just €150, and there are two main reasons why I made this purchase:
                                      1. I already own the exact same model, but its plastic chassis is badly damaged.
                                      ...
                                      06-10-2025, 04:24 PM
                                    • Rolin
                                      Lenovo Legion 5 15IMH05H No Display
                                      by Rolin
                                      I have a Lenovo Legion 5 15IMH05H 81y6003yUS that someone asked me to help them with a failing SSD. I installed a new SSD, fresh Win11 installation, updates, etc. Very standard stuff and everything was completed. He said he'll pick it up in a few days so I shut it down and set it aside.

                                      A few days later came and now it won't POST an image, keyboard lights up, fans spin then shuts itself off after about 40 seconds. I've already tried the typical draining capacitance and removed CMOS battery,etc. No display on an external HDMI monitor as well.. No idea what happened. Suspected a BIOS...
                                      Yesterday, 11:32 PM
                                    • Loading...
                                    • No more items.
                                    Working...